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OBJECTIVE
 Definition of Centerless grinding.
 Describe the relationship between the
three main components used in
cenerless grinding.
 Describe advantages of centerless
grinding.
 Describe the component of the
centerless grinding.
 Describe how the regulating wheel
determines workpiece rotational speed.
 Indentify Grinding wheel Imbalance
FIGURE 2.The regulating wheel is anglead slightly to
enable workpiece through feed.
2
DEFINITION OF CENTERLESS GRINDING
Centerless grinding is a machining
process that uses abrasive cutting
to removal material from a
workpiece.
3
CENTERLESS GRINDING.
4
 Common type of
Cylindrical grinding.
 Three main parts are used.
i) Grinding wheel
ii) Regulating wheel
iii)Work Rest Blade
 This component hold the work piece horizontally.
 Rotate it & Grain its Surface.
 Each component plays the roll in the grinding
process.
FIGURE: A Typical centerless grinding configuration
HOW THE CENTERLESS GRINDING WORKS.
 The work rest blade supports
the part slightly.
 It is made of wear-resistant
material.
 The regulating wheel rotates the
Cylindrical parts.
 It is commonly made of plastic
or rubber bond.
 The actual grinding is performed
by Grinding wheel.
 Both the wheel must be
periodically dressed and trued
to maintain precise roundness
of the workpiece
 FIG. Shows a typical machine
built for Centerless Grinding. 5
 The parts they Grind always must be round.
 However, Setup is fast
 And the process Can be automated.
6
ADVANTAGES OF CENTERLESS GRINDING
 It Enables Fast, accurate
production of complicated
hand-held parts or workpiece that
require Tight Tolerances.
 Decrease grinding time.
 Automatic Feeding method.
 Reduce grinding wheel wear.
 Grinding of longer parts.
 Low Maintenance.
7
FIGURE: center less grinding is often used to produse small Parts
such as bearings.
Centerless grinding is often used to mass production small parts
such as bolts , shafts, bearings, hubs or valves.
MAIN CATEGORIES OF CENTERLESS GRINDING.
 Generally, all centerless grinder fall under two main
categories.
i) Angular-bed-grinders
ii)Horizontal-bed-grinders
 On an angular-bed-grinder, the rotating regulating
wheel rotates the part @ specific rate .
 Angular-bed-grinders are usually used to grind
heavier workpieces or workpieces that require a
fine surface finish.
 The horizontal-bed centerless grinder is the most
common design.
 The parts being to rotate only after it touches the
rotating grinding wheel.
8
MAIN COMPONENT OF MACHINE.
 A cast iron bed supports the
grinder and contains the
grinding and regulating wheel
head assembly and hydraulic
reservoir.
 A wheel head contains the
grinding wheel and grinding
wheel spindle.
 A swivel plate is mounted to
the bed and tilts or aling the
regulating wheel parallel to
the grinding wheel.
 A lower slide is attached to
the swivel plate and moves
the regulating wheel and
workrest blade towards or
away from the workrest blade.
9
FIG. The main component of centerless grinder
 An upper slide is attached to the lower slide and
moves the regulating wheel towards or away from
the workrest blade.
 A regulating wheel housing is mounted to the
upper slide and houses the regulating wheel
houses the regulating wheel and regulating wheel
spindle.
 A work rest is mounted to the lower slide and
supports the work rest blade.
10
THE REGULATING WHEEL & WORKPIECE
ROTATIONAL SPEED.
o During centerless grinding, the
Regulating wheel plays a key
role in the grinding of workpiece.
o Two key factors that the regulating
wheel controls are rotational
speed of the workpiece and the
feed rate of the workpiece.
o The surface speed of the
regulating wheel controls the
rotational speed, or work speed,
of the workpiece.
o During a centerless grinding
operation, the regulating wheel
rotates the workpiece by rotating
against it, as shown in fig.
11
FIG: The regulating wheel rotates the workpiese
by revolving against it a uniform rate.
 Surface speed is the uniform rate at which the
regulating wheel revolves against the workpiece.
 Surface speed rate is measured in revolutions per
minute (RPM).
 Most regulating wheel revolves between 30 and 40
rpm.
 The work speed of the workpiece is approximately
equal to the regulating wheel surface speed.
12
DETECTING GRINDING WHEEL IMBALANCE
 A simple method for detecting
wheel imbalance is to take a wheel
that has been mounted on a
mandrel.
 It is set between two equal points,
such as the balancing stand
shown in fig.
 If the wheel stays at rest, even if it
rotated to a new position, it is said
to be static balance.
 If the wheel is then pushed along
the stand, and it rotates smoothly,
stopping only when it loses
momentum, the wheel is said to be
in dynamic balance.
 If the wheel is out of balance , it will
rock back and forth before coming
to rest with its heaviest side down. 13
FIG: Placing a grinding wheel on a balancing
stand will determine if one side is heavier than
another.
14

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CENTRELESS GRINDING

  • 1. 1
  • 2. OBJECTIVE  Definition of Centerless grinding.  Describe the relationship between the three main components used in cenerless grinding.  Describe advantages of centerless grinding.  Describe the component of the centerless grinding.  Describe how the regulating wheel determines workpiece rotational speed.  Indentify Grinding wheel Imbalance FIGURE 2.The regulating wheel is anglead slightly to enable workpiece through feed. 2
  • 3. DEFINITION OF CENTERLESS GRINDING Centerless grinding is a machining process that uses abrasive cutting to removal material from a workpiece. 3
  • 4. CENTERLESS GRINDING. 4  Common type of Cylindrical grinding.  Three main parts are used. i) Grinding wheel ii) Regulating wheel iii)Work Rest Blade  This component hold the work piece horizontally.  Rotate it & Grain its Surface.  Each component plays the roll in the grinding process. FIGURE: A Typical centerless grinding configuration
  • 5. HOW THE CENTERLESS GRINDING WORKS.  The work rest blade supports the part slightly.  It is made of wear-resistant material.  The regulating wheel rotates the Cylindrical parts.  It is commonly made of plastic or rubber bond.  The actual grinding is performed by Grinding wheel.  Both the wheel must be periodically dressed and trued to maintain precise roundness of the workpiece  FIG. Shows a typical machine built for Centerless Grinding. 5
  • 6.  The parts they Grind always must be round.  However, Setup is fast  And the process Can be automated. 6
  • 7. ADVANTAGES OF CENTERLESS GRINDING  It Enables Fast, accurate production of complicated hand-held parts or workpiece that require Tight Tolerances.  Decrease grinding time.  Automatic Feeding method.  Reduce grinding wheel wear.  Grinding of longer parts.  Low Maintenance. 7 FIGURE: center less grinding is often used to produse small Parts such as bearings. Centerless grinding is often used to mass production small parts such as bolts , shafts, bearings, hubs or valves.
  • 8. MAIN CATEGORIES OF CENTERLESS GRINDING.  Generally, all centerless grinder fall under two main categories. i) Angular-bed-grinders ii)Horizontal-bed-grinders  On an angular-bed-grinder, the rotating regulating wheel rotates the part @ specific rate .  Angular-bed-grinders are usually used to grind heavier workpieces or workpieces that require a fine surface finish.  The horizontal-bed centerless grinder is the most common design.  The parts being to rotate only after it touches the rotating grinding wheel. 8
  • 9. MAIN COMPONENT OF MACHINE.  A cast iron bed supports the grinder and contains the grinding and regulating wheel head assembly and hydraulic reservoir.  A wheel head contains the grinding wheel and grinding wheel spindle.  A swivel plate is mounted to the bed and tilts or aling the regulating wheel parallel to the grinding wheel.  A lower slide is attached to the swivel plate and moves the regulating wheel and workrest blade towards or away from the workrest blade. 9 FIG. The main component of centerless grinder
  • 10.  An upper slide is attached to the lower slide and moves the regulating wheel towards or away from the workrest blade.  A regulating wheel housing is mounted to the upper slide and houses the regulating wheel houses the regulating wheel and regulating wheel spindle.  A work rest is mounted to the lower slide and supports the work rest blade. 10
  • 11. THE REGULATING WHEEL & WORKPIECE ROTATIONAL SPEED. o During centerless grinding, the Regulating wheel plays a key role in the grinding of workpiece. o Two key factors that the regulating wheel controls are rotational speed of the workpiece and the feed rate of the workpiece. o The surface speed of the regulating wheel controls the rotational speed, or work speed, of the workpiece. o During a centerless grinding operation, the regulating wheel rotates the workpiece by rotating against it, as shown in fig. 11 FIG: The regulating wheel rotates the workpiese by revolving against it a uniform rate.
  • 12.  Surface speed is the uniform rate at which the regulating wheel revolves against the workpiece.  Surface speed rate is measured in revolutions per minute (RPM).  Most regulating wheel revolves between 30 and 40 rpm.  The work speed of the workpiece is approximately equal to the regulating wheel surface speed. 12
  • 13. DETECTING GRINDING WHEEL IMBALANCE  A simple method for detecting wheel imbalance is to take a wheel that has been mounted on a mandrel.  It is set between two equal points, such as the balancing stand shown in fig.  If the wheel stays at rest, even if it rotated to a new position, it is said to be static balance.  If the wheel is then pushed along the stand, and it rotates smoothly, stopping only when it loses momentum, the wheel is said to be in dynamic balance.  If the wheel is out of balance , it will rock back and forth before coming to rest with its heaviest side down. 13 FIG: Placing a grinding wheel on a balancing stand will determine if one side is heavier than another.
  • 14. 14